THE PHOSPHONIOBATE RBNB2PO8 - AN ORDERED SUBSTITUTION OF PO4 TETRAHEDRA FOR NBO6 OCTAHEDRA IN THE HTB STRUCTURE

被引：6

作者：

LECLAIRE, A

BOREL, MM

GRANDIN, A

RAVEAU, B

机构：

[1] Laboratoire CRISMAT, Associé au CNRS, ISMRA, 14050 Caen Cedex, Boulevard du Maréchal Juin

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1994年 / 110卷 / 02期

关键词：

D O I：

10.1006/jssc.1994.1167

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A new phosphoniobate, RbNb2PO8, with an intersecting tunnel structure, has been synthesized. It crystallizes in the Pnma space group with a = 13.815(1) angstrom, b = 15.884(2) angstrom, c = 12.675(2) angstrom, and Z = 16. The full matrix least-squares refinement led to R = 0.041 and R(w) = 0.050. The host lattice is derived directly from that of the hexagonal tungsten bronzes (HTB) by an ordered substitution of PO4 tetrahedra, forming two sorts of tunnels running along b and a, respectively, where the Rb+ ions are located. The first type of tunnel results from the stacking of six-sided HTB-type rings (5NbO6 octahedra + 1PO4 tetrahedron) with seven-sided rings (4NbO6 octahedra + 3PO4 tetrahedra), whereas the second type of tunnel consists of brownmillerite rings (4NbO6 octahedra + 2 PO4 tetrahedra). (C) 1994 Academic Press, Inc.

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页码：256 / 263

页数：8

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